/*
 
(c) 2008 by Sławek Kruczek
slav.mir@gmail.com
 

This program is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.

This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.

You should have received a copy of the GNU General Public License
along with this program.  If not, see <http://www.gnu.org/licenses/>.

*/


package analytics.util;

public class RPNNegatedVariable extends RPNVariable {

    
    
    public static RPNNegatedVariable parseVariable(String name) {
        switch(name.charAt(0)) {
            case 'x': return new RPNNegatedVariable(Type.X);
            case 'y': return new RPNNegatedVariable(Type.Y);
            
            default: return null;
            
        }
    }
    
    public RPNNegatedVariable(Type type) {
        super(type);
    }

    @Override
    public void exec(RPNExecutionEnvironment env) {
        switch(type) {
            case X: env.pushNX(); break;
            case Y: env.pushNY(); break;
        }
    }

}
